Valve-stem adapter for inner-tube molds



Dec. 11, 1928.

A. A. GLVIDDEN ET AL VALVE ISTEM ADAPTER FOR INNER TUBE MOLDS Filed Sept. 30, 1927 3. Uefa/'670715.

vvPatented Dec.

' UNTEO STATES VPar/151m OFFICE.

ALFRED A. GLIDDEN AND THOMAS M. HNOWLAND, or WATERTOWN, AND WILLIAM T. EIOH, JE., OE NEWTON, MASSACHUSETTS, ASSIGNORS To HOOD EUEBEE. cOMrANY, OE WATEETOWN, MASsAoHUsETTsA CORPORATION -OE MASsAcHUSETgrs.

'VALVE-STEM ADAPTER FOR INNER-TUBE MOLDS.

I Application led September 30, 1927. Serial No. 223,082.

This invention relates to a valve stem adapter for inner ytube molds. p

The object of the invention is to provide a device which will encircle the valve stem ,5 'of an inner tube and hold the latter securely .clamped within the mold for said inner tube at the point where the valve stem passes Outvvwardly through theI mold, the device, furthermore, beine' so associated with the mold'. ,l that the material of which the inner tube is constructedl will not flow around the, valve stem during the vulcanizing Operation, thereby causing'the threads of the valve stem to become clogged and making it necessary to remove the material from the threads.

Another"l very importantobject of the infvention, which is attained by our improved adapter, is that the portion of the'tube imlmediately surrounding the valve stem and l known as the valve base is prevented from '.leaking4 out around the valve stem, which would weaken the portion of the tube inu-y mediately adjacent tothe valve stem, the tube, by use of' our adapter is thus left of its Original form and thickness and strength.`

i The invention consists in a mold and valve stem adapter therefor asset forth in the following specification and particularly as pointed out in the claims thereof.

Referring to the drawings: Figure 1 represents aplan view of a mold for an inner tube and valve stem adapter therefor embodying our invention.

Fig. 2 is an enlarged transverse section through the mold as taken on the lineJ 2-2 of Fig. l1, an inner tube and valve' Stem adapter being illustrated inposition lwithin the mold.

.F-ig. 3 isaf'detail section taken on the line 3-3 of Fig. 2."

Fig.;4 is a side elevation of the sleeve. Fig'. 5 is a side 'elevation vof the nut.

. Fig. 6 is an en d view of the sleeve as viewed from the inner/end thereof.

v Likenumerals refer to like 'parts throughout the several views of the drawings. Y In the drawings, 5 is an annular tubula mold for an inner tube 6, saidmold consisting of two semi-'tubular sections 7 and 8 hinged together at 9. The section 7 has an Outer flange 10 extending therearound and@ an inner iiange 11 also Jextending therev and when said nut is rotated in the proper around. The section 8 has an outer ilange 12 and an inner flange 13 extending therearound.

The inner tube 6 is provided with an air valve stem 14 -of well-known construction, and when the inner tube .is in position with in the mold the valve stem 14' projects into and through a sleevel 15 which is mounted- 60 within the mold secticin 8. .The v sleeve 15 in addition to projecting through an opening provided thereforinthe mold section 8 is held in position upon the flange 13`of said. mold section by a calp- 16, the lattei` being lfastened -to lsaid ilange by screws 17. The Sleeve 15 .has atapered head portion 18 vformed attlie inner end thereof, said head portlon vfitting a correspondingly ta,- pered recess A19 provided in the mold section 8. The Sleeve 15 has an opening 20 eX- tending longitudinally therethrough and adapted to receive the valve stem '14, and for a portion of its length saidV Opening 20 is flattened upon opposite sides thereof. at 21 1n order that said sleeve vmay engage {iattenedsurfaces 22 providedupon the oppo- `site sides of the valve st em 14. The sleeve the engagement Of the I'iattenejd surfaces 21 and 22.

, A. nut 23 is provided for the valve stem-14 direction to advance the nut upon said valve stem, the inner end of the nut will engage the edge of the flange 13, thereby drawing the valve stem intothelsleeve 15 and bringing the inner tube 6 into contact with the inner end of the sleeve and clamping the. inner tube between a flange 24 provided upon the Valve Stem and the extremity of the sleeve. At the same time the sleeve 15 will be drawn into the opening provided therefor in the valve section 8 until the head 18 clamped within its recess 19. The exterior Surface of thef nut 23 is knurled at ,25'to facilitate the rov, tation of said-nut upon the valve stem 14.

In utilizing'the device of this-invention the 100 sleeve 15 is attached to the valve'stem 14 of the inner tube 6,.and'the latter in a partially inflated condition is placed within the mold y section 8 with the valve stem and sleeve pro-v,

for in the mo d section. T e nut 23 is then attachedto the valve stem 14 and'sad nut is rotated upon said valve stem until the inner tube is tightly clamped between the flange 24 ofthe valve stem and the adjacent extremity of the sleeve, at which time the latter will itself be securely clamped within the mold. The mold section 7 is 'then closed upon the section 8 and clampedthereto and the inner tube inflated, the air valve vand the valve base being firmly held in the position illustrated in Fig. 2 by the adapter.

The operation of vulcaniz-ing' the inner tube can then be performed Without danger of the material of which the inner tube is constructed flowinvr around the valve stem 14 and clogging thethreads thereof, thereby making it necessary to remove said material. from said threads after the inner tube is removed from the mold, and also thereby weaksleeve.

in said mold, and' at thel same time the..

ada ter itself is rigidly securedto the mold.

e claim: 3 A y 1. In combination a mold, a sleeve-mounted therein and constructed and positioned to encircle the valve stem o f an inner tube lo-` cated within said mold, and means upon said valve stemto clamp the inner tube to the 2. In combination a mold, a sleeve slidably mounted within said mold and constructed and positioned to encircle the valve stem of an inner -tube located within said' mold, and means upon said valve stem to clamp the inner tube to the sleeve.

. 3. In combination a'mo1d,.a sleeve slid-V ably mounted within said mold and constructed and positioned to encircle the valve lstem of an inner tube located within said mold, and means upon said valve stem and said mold to clamp the innertube eeve and the sleeve within the mold.

4. In combination a; mold, a sleeve'mounted therein and constructed and positioned to encircle the valve stem-of an inner tubelo! cated Within said mold, and a nut havingI screw-threaded engagement with said valve" stem and clamping the inner tube to the sleeve.l I

5. In combination a mold, a sleeve mounted thereinand constructed and positioned to encircle the valve stem of an inner tube located within said mold, v`,means to prevent a rotative movement of said sleeve upon'said valve stem, and means upon the valve stem and engagin the mold to clamp the inner tubledto the s eeve and the sleeve. within the mo cov . 6. In combinationamold,asleeve mounted l, therein and constructed and positioned toencircle the valvepstem ofI an inner tube located Within said'mo'ld, means to prevent a' rotative movement of said sleeve upon said mold.

7. In combinationa mold, sleevel slidablymounted Within said mold and constructed and positioned to encircle the valve stem of an inner tube. located within said mold, a'

head on the inner end of said sleeve, and means upon sald valve stem and engaging said mold to clamp the inner tube to the sleeve4 and the head of said' sleeve against the' mold."

8. In combination, 'a mold, a sleeve slid -ably mounted Within said mold land constructed and positioned to encircle the valve stem of an inner tube located within said mold, a conical head on said sleeve fitting a tapered recess in said mold, andy means upon, said valve stem and enga ing said moldl to clamp the inner tube to t esleeve andthe head of said sleeve against themold.

ftubeto the sleeve andv also preventing a longitudinal lmovement ofthe sleevewithin the Iy In testimony whereof ywe have hereunto s et ourv hands.

ALFRED A. GLIDDEN.`

VTHOMAS M. KNOWLANI).

WILLIAM T. RICH, Jn. 

